As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT SEAT LATCH RELEASED DURING TAKEOFF ALLOWING PILOT TO SLIDE AFT. PILOT WAS UNABLE TO REACH CONTROLS CAUSING ACCIDENT. THE SEAT RAILS AND SEATS INSTALLED WERE OF CESSNA DESIGN AND TYPE. SUBMITTER STATES THIS ALTERATION HAS BEEN INCORPORATED ON MANY PIPER PA-14 AIRCRAFT AND SHOULD REQUIRE THE ACCOMPLISHMENT OF THE CESSNA AD NOTE 87-20-03R2 AT EACH ANNUAL.